Power-transmitting mechanism.



Patented sept. l2, |899. JANSEN.

PUWER TRANSMITTING MECHANISM.

Application filed Mar. 7, 1899.) (No Modem Y 2 Shees-Sheet l- PatentedSept. l2, 1899.

B. JANSEN.

POWER TRANSMITTING MECHANISM.

(Application led Mar. 7, 1 899.

2 Sheets- Sheet 2,

(No Model.)

fff/

UnirrEn STATES PATENT EEicE.

.BRUNO JANSEN, OF AUGSBURG, GERMANY.

POWER-TRANSMITTING iVI ECHANISIVI.

SPECIFICATION forming part of Letters Patent No. 632,944, datedSeptember 12, 1899.

Application filed March 7,1899. Serial No. 708,089. (No model.)

.To MM whom, 1in' 71u07/ concer/t:

Be it known that l, BRUNO JANSEN, a citizen of Germany, and a residentof Augsburg, Germany, have invented certain new and useful Improvementsin Power- Transmitting Mechanism, of which the following is aspecification.

When with the known friction-wheel transmissions the power is suddenlychanged, a gliding between the wheels at the point of transmission willtake place, because the contact-pressure is too small. To avoid thisdefeet, a contact-pressure for both wheelsv would have to be selected,which would frequent-ly exceed the maximum pressure necessary for thetransmission. This unnecessarily high pressure also necessitates astronger construction of the entire mechanism, causes rapid wear, andmust be suffered during the normal operation, where it is not at allrequired and where it produces an increased pressure on the journals.

The present invention relates to an improved arrangement by which duringa change of power by sudden thrusts, tbc., the contact-pressure of thetwo friction-wheels is also changed, that it is increased during anincrease of pressure, and vice versa, so that it will always correspondto the height of the pressure to be transmitted Thus during a normaloperation an excessive pressure will be avoided; but at a change ofpower orduring sudden thrusts a sliding of the wheels will not takeplace.

The accompanying drawings illustrate different embodiments of theinvention.

Figure lis a side elevation of the 'transmitting mechanism; Fig. 2, alongitudinal section thereof. Figs. 3 to 7 illustrate various details.Fig. 8 illustrates a modification in which the friction-disk is pressedagainst the friction-roller. Fig. S is a cross-section on line 8 8, Fig.8; Fig. 9, a side elevation of afurther modiiication, showing it adaptedto belt transmission; and Fig. l0, a front view thereof.

In Figs. l to 7 the letter ct represents the shaft, to which motion isto be transmitted by means of the friction-disk Z2 and roller c. Theshaft (l, carrying the friction-roller c, is journaled at one end in amovable bearing h, the

pressure between the parts b c. The other end of the shaft CZ isprovided with a socket or nut c, having a steep thread which is engagedby a screw la of corresponding pitch. The screw 7c is provided with asocket Z, that receives the driving-shaft o', such shaft having a pin a,that engages a slit m of the socket Z, so that the shaft will drive thescrew 7;.. The shafts t and d are guarded in their bearings againstlateral displacement, so that they can only rotate.

The socket l is embraced by a sleeve 0, which does not participate inthe rotation of the socket, but is moved endwise during the longitudinalshifting of the same by means of the engagement of a pin in a circulargroove of the socket. The sleeve o is by rod p connected to a two-armedlever q, turning on shaftj and carrying at its free end a springarm r.The connection between the parts p 0 is effected by a clasp t,surrounding the sleeve. The leverq is so mounted and shaped that duringa shifting of the parts l o the spring r will press upon a pin s, whichisconnected to the bearing h of shaftd, and in this way the roller cwill be forced against-the friction-disk b to increase the degree offrictional contact. As long as the driving power remains constant theshaft z' will drive the screw lo, and the latter will drive shaft clwithout causing the screw to advance within the socket l, as these partsare held back by the resistance of bearing h and pin s. The spring r is,however, held under such tension that by it the roller c is pressedagainst the disk b to correspond to the power to be transmitted. It' agreater power is to be transmitted or if the power-shaft receivessuddenly stronger impulses or thrusts, this shaft will rotate quickerthanshaft d, so that the screw la will be screwed into the nut e,longitudinally moving the sleeve o. This displacement of the sleevetoward the left, Fig. 2, will by rod p effect a stronger tension ofspring r, which in turn will bear more firmly upon pin s to move thebearing h toward disk b and increase the con tact-pressu re of roller cagainst such disk, so as to prevent slipping between these parts. If thepower is decreased or if the thrusting impulse is removed, the screw 7cwill screw out of nut e, and the contactposition of which determines thedegree of l pressure is by the recession of the parts again IOOdiminished, so that during the normal operation the requisite pressureonly will always be maintained.

In Figs. S and 8 the friction-disk h' is mounted upon shaft CZ', whilethe frictionroller c transmits the power to shaft a. To adjust thecontact-pressure, the friction-disk b' is provided with a sleeve Z',movable in its bearing. The screw k' is mounted upon the shaft CZ and isengaged by a nut c', having ribs g', that engage slotsf' of sleeve Z.Between the nut e' and a shoulder Z2 of sleeve Z' is arranged a coiledspring 7*'. The nut c is by spring 7" and the pitch of screw Ztinfluenced to so adjust itself that the disk Z7' is pressed againstroller c with the requisite degree of pressure. The nut e' will drivethe sleeve Z'I and disk b', and the latter will transmit motion to shaftu by roller c'. If the power of shaft- 27' is increased, the nut e' willmove upon screw 7s', as the shaft CZ is not movable longitudinally, andthus the tension of spring Ir will be increased to increase thecontact-pressure between the parts ZJ c'.

In Figs. f) and l0 the shaft (Z3, carrying the dri ving-pulley b3, isconnected to the drivingshaft Z3 by the screw 7a3, the relative positionof these parts being determined by a spring (not shown) which is putunder tension in proportion to the power to be transmitted. For thisconstruction the arrangement shown in Figs. l and 2 or in Fig. S may beadopt-ed. Upon shaft Z3 a sleeve Z3, having pin n3, is so mounted thatit is moved longitudinally by the shaft when the latter is shifted, butwill not participate in the shafts rotation. The pin 91.3 engages theforked end of a bell-crank Z3, turning at 003, and having its shorterarm connected to a draw-bar or similar device p3. This bar connects thebell-crank 'Z3 with a pressure-lever r3, carrying at its end abelttightener s3, that determines the tension of the belt h3, by whichthe power is transmitted to the pulley c3. In order to maintain thetension of the belt constant and to prevent the regulating mechanismfrom acting when, for instance, the joint of the belt passes thetightener s3, a spring p4 may be inserted in the draw-bar p3.

The operation is as follows: If by reason of a change in the power to betransmitted the screwis screwed in, the sleeve Z3 will be shifted towardthe right, Fig. l0. The bell-crank 153 will by rod 3and lever r3 pressthe tightener against the belt h3, so that the tension of the belt isincreased. mitted is diminished, the tension of the belt is decreased bythe decreased pressure of tightener s3 and the bearings will be partlyrelieved of the pressure resulting from the tension of the belt.

1. In a power-transmitting mechanism, the combination of a nut with ascrew adapted to be driven into the nut by an increased application ofpower, and means operated by the screw for adjusting the pressurebetween the parts of the transmitting mechanism in accordance with theposition of the screw, substantially as specified.

In a power-transmitting mechanism, a pair of friction-disks in contact,combined with a movable bearing for supporting one of said disks, ascrew influenced by the powershaft, and means actuated by said screw foradjusting said bearing and the frictional contact' between the disks inaccordance with thc power to be transmitted, substantially as specified.

In a power-transmitting mechanism, the combination of a shaft with ascrew, a nut engaged thereby, a spring for maintaining the parts intheir normal position, and a pair of' friction-disks, the tension of thespring being adapted to be changed by the position of the screw7 topress the friction-disks together in proportion to the degree of powerto bc transmitted, substantially as specified.

4. The combination of a friction disk and roller with a shaft, a screwengaging the same, a movable bearing for the shaft, a second shaftengaging the screw, a longitudinallymovable sleeve actuated by thescrew, and means for connecting said sleeve with the movable bearing,substantially as specified.

5. The combination of a friction disk and roller with a shaft, a screwengaging the same, a movable bearing for the shaft, a second shaftengaging the screw, a longitudinallymovable sleeve actuated by thescrew, a lever connected to the sleeve, a spring-arm secured to thelever, and a pin engaged by the spring-arm and connected to the movablebearing, substantially as specified.

Signed by me at Munich, Bavaria, this 21st day of February, 1899.

BRUNO JANSEN. Vitnesses:

HELL PHILOMINA, EMIL IIENZEL.

lf the power to be trans- IOO

